When it comes to names, Siri can read better than it can listen

Macworld
Getting Siri to pronounce a complex or foreign-sounding name can be a challenge. Why? Because Siri’s method of determining how to pronounce proper names depends on your device’s system language. In the U.S. and other English-speaking regions, Siri’s pronunciation is governed by English phonetic rules. When Siri is confronted with a name, say of Italian origin like Vito Corleone or of Chinese origin like Xiaoyan Zhou, it will likely need help in getting the spoken pronu